JPS6159486B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal display element that is easy to manufacture, easy to see, and capable of displaying multiple types of colors.

FIG. 1 shows a speedometer for an automobile as an example of a conventional liquid crystal display element capable of displaying a plurality of colors, FIG. 1B is a front view, and FIG. In the figure, 1 is an upper glass plate, 2 is a liquid crystal layer, 3 is a lower glass plate, 10 is a colorless polarizing plate, 20 is a green color polarizing plate, 21 is a yellow color polarizing plate, 22 is a red color polarizing plate, 30 is a green color polarizing plate 31 is a yellow display part, 32 is a red display part, 40 to 43 are colorless and green, green and yellow, yellow and red, respectively.
This is the connecting part between the red and yellow polarizing plates. In this display element, where no voltage is applied between the electrodes and no electric field is formed, the background color is usually close to white, but at the electrode positions where voltage is applied, the area is covered. The color will be the same as the color polarizing plate. That is, when a voltage is applied to the segment electrodes covered by the green color polarizing plate 20, the green segments of the green display section 30 appear in a background color close to white, and a color display is performed.
The same applies to displaying other colors.

However, in the conventional liquid crystal display element for color display, it is very difficult and requires a lot of man-hours to bond the polarizing plates of each color without creating gaps at the joints; Bubbles may appear at the edges or the degree of polarization may decrease, making the joints unsightly; color polarizing plates have a lower degree of polarization than ordinary colorless (displayed in black and white) polarizing plates, so contrast There were problems such as insufficient capacity.

An object of the present invention is to provide a liquid crystal display element that is free from the above-mentioned problems and is capable of color display.

In order to achieve the above object, in the present invention,
The lower surface of the lower polarizing plate was divided into a plurality of locations according to the display type, and each of these locations was printed with an arbitrary color. In this way, the areas where no voltage is applied between the electrodes appear in the color printed on the lower surface of the lower polarizing plate, but the areas where the voltage is applied are black. That is, a plurality of types of color display can be performed by combining a specific background color and the black color of the display electrode portion.

FIG. 2 shows an example of a speedometer for an automobile embodying the present invention, where FIG. b is a front view and FIG. a is a sectional view taken along line B-B' in FIG. In the figure, 50 is a green printing part, 51 is a yellow printing part, 52 is a red printing part, 60 is a green display part, 61 is a yellow display part, 62 is a red display part, and other symbols are the same as in FIG. It is. In the car speedometer shown in Figure 1, the rightmost position of the colored segment (in a color other than white) indicates the speed, whereas in this example, the leftmost position of the black segment indicates the speed. There is. With both displays, you can immediately tell whether your speed is in the green zone, yellow zone, or red zone. In the case of such a bar graph display, as shown in Fig. 2b, the gap between the segment electrodes is generally narrowed to hide the colored part of the ground color as much as possible, and the length of the bar-like part of only the colored ground color is
It is preferable to display the amount to be displayed (for example, speed).
However, depending on the purpose of the display, a color display in which a black electrode pattern appears in a specific color background is of course also effective. The surface of the lower polarizing plate can be easily colored by printing using the so-called tacho printing method or the like. As shown in Figure 1, it is a very difficult task to attach color polarizing plates without any gaps between them, especially in areas where black and white display is to be performed, as shown in Figure 3. This task becomes especially difficult when there are scattered dots and color display parts. However, according to the present invention, as shown in FIG. 4, for example, as shown in FIG. If you print on top of the layers, there will be no gaps at all at the joints. In the case of the present invention, the reflected light from the printed area is used, and the transmitted light is not used, so there is no problem even if there are areas where the printed layers of two colors overlap. Furthermore, even if one display element has three parts that display green, as in the example shown in FIG. There are no physical problems, and this kind of work is much easier than the difficult work of gathering color polarizing plates of each color and pasting them together so that there are no gaps or overlaps at the joints. By printing ink to a thickness of about 10 μm, it is possible to display clear colors, and the colors are clearer and easier to see than when using color polarizing plates.
Furthermore, unlike when a color polarizing plate is used, phenomena such as bubbles occurring at the edges at the joints or a decrease in the degree of polarization resulting in an unsightly appearance do not occur.

As described above, according to the present invention, it is possible to produce a liquid crystal display element that is more durable than the conventional one and that provides an easy-to-read color display extremely easily and at a low cost.

[Brief explanation of the drawing]

FIG. 1 shows a conventional liquid crystal display element that displays multiple colors, b is a front view, a is a sectional view taken along the line A-A', FIG. 2 is an embodiment of the present invention, and b is a front view;
a is a sectional view taken along the line B-B', FIG. 3 is a diagram showing an example of a display element in which color display parts are interspersed in a black and white display part, and FIG. 4 is a connecting part of different color display parts in an embodiment of the present invention. FIG. 10...Colorless polarizing plate, 20...Green color polarizing plate, 21...Yellow color polarizing plate, 22...Red color polarizing plate, 50...Green printing section, 51...Yellow printing section, 52...Red printing Part, 60...green display part,
61...Yellow display section, 62...Red display section.

Claims (1)

[Claims] 1. In a liquid crystal display element comprising electrodes on the inner surfaces of two opposing glass plates, a liquid crystal sandwiched between the glass plates, and upper and lower polarizing plates disposed on the outer surfaces of both glass plates, the lower Divide the bottom surface of the polarizing plate into multiple areas, print any color on each of these areas, and
1. A liquid crystal display device characterized in that a plurality of types of color display can be performed by displaying a combination of the black color of the electrode portion to which a voltage is applied and the background color produced by the printing.